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E39 (1997 - 2003) The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

Experts: I was just sold a job by my local indy. The main coolant supply line was leaking. Apparently, it was failing right where it becomes buried inside the intake manifold. Replacing the hose took 3 hours labor. Plausible?

Yes, I'm aware that overhauling the whole cooling system at once is prudent... I thought I had virtually everything done but small pieces pop up every 6 months or so.

I ask because I trust this shop mostly but need a reality check on labor times.... I expect them to turn profit on me, I just want to be aware of how much!

Then my suggestion is open your hood and do a quick check or post a pic of what your engine bay looks like, then figure out all the heater hoses that need to be replaced and do them all to save you labor (or even engine overheat later).

Heater Hoses are like tires, when one tire is worn down, then chances are the other three (3) tires are also worn.
So replace them all to save money later.